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x in (-oo:+oo)
x/0.3 = 12 // - 12
x/0.3-12 = 0
3.33333333*x-12 = 0 // + 12
3.33333333*x = 12 // : 3.33333333
x = 12/3.33333333
x = 3.6
x = 3.6
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